# Ch 6: 4th Grade Math: Multiplication Strategies & Mental Math

### About This Chapter

## 4th Grade Math: Multiplication Strategies & Mental Math - Chapter Summary

With this chapter, you can explain multiplication strategies and mental math to your 4th grade students. Whether your students are struggling with what they are learning in class, or if they need a challenge and wish to get ahead, our lessons provide you with an easy-to-use resource. The chapter menu lets you quickly see all of the lesson topics. Scroll through the menu to find individual topics, or start with the first lesson and go all the way through the chapter. Assessment tools, including lesson quizzes, will help your students determine how well they understand the information.

## Chapter Topics

- Using the rectangular array for multiplication facts to 10
- Multiply numbers mentally by 1,000, 100, and 10
- Determining multiples of whole numbers
- Figuring out the least common multiple
- 2- and 3-digit number multiplication
- Using the expanded form to multiply
- Multiplication strategies using mental math
- Techniques for estimating products
- Multiplying factors and checking your work
- Examples of the commutative property of multiplication
- Multiplication word problems using 3-digit numbers

### 1. Learning Multiplication Facts to 10 Using Rectangular Array

In this video lesson, you will learn what a rectangular array looks like when it is used to show multiplication. You will also learn how to create your own multiplication array to practice multiplication.

### 2. How to Mentally Multiply by 10, 100 & 1,000: Lesson for Kids

Can you multiply 3 times 1 in your head? Sure. How about 2 x 10? Maybe. But how about 352 x 1,000? Well, you will be able to multiply by 1,000 at the end of this lesson.

### 3. Finding Multiples of Whole Numbers

After watching this video lesson, you will become a pro at finding multiples of whole numbers. Learn what they are and how you can visualize the process to make it easier for you.

### 4. How to Find the Least Common Multiple

The least common multiple of two numbers is the smallest number that can be divided evenly by your two original numbers. See some examples of what I'm talking about here!

### 5. Multiplying by Two & Three Digit Numbers: Lesson for Kids

Multiplication can be done in different ways with different digits. In this lesson, you will learn how to multiply two-digit and three-digit numbers by two-digit numbers using both standard form and expanded form multiplication.

### 6. How to Multiply Using Expanded Form

In this lesson, you will learn what expanded form means, how to convert numbers into expanded form, steps to successfully complete expanded form multiplication, and will view example problems using expanded form multiplication.

### 7. Mental Math Strategies for Multiplication: Lesson for Kids

This lesson has strategies for multiplying large and small numbers in your head. Learn mental math techniques so that you can convert complex multiplication into simpler multiplications and use addition and subtraction to save time.

### 8. How to Estimate Products

In multiplication problems, sometimes we want to get an answer that is 'close enough,' not exact. In this lesson, you will learn how to estimate products to get a 'close enough' answer.

### 9. Multiplying Factors & Verifying Your Work: Lesson for Kids

Think about multiplying 7 x 8. Knowing the product of these two factors can help you understand other concepts in mathematics. In this lesson, you'll practice multiplying three factors together at a time.

### 10. Commutative Property of Multiplication: Definition & Examples

In this video lesson, we talk about the commutative property of multiplication. We will see how it works in action and what it means for you when you are solving multiplication problems.

### 11. Three Digit Multiplication Word Problems

Do you ever wonder why on earth you need to learn multiplication? Do you think math class is the only place to use your multiplication skills? This lesson will give you real-life examples of when you will need to know how to use three-digit multiplication.

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### Other Chapters

Other chapters within the 4th Grade Math course

- 4th Grade Math: Numbers & Number Sense
- Multiples of Whole Numbers
- 4th Grade Math: Understanding Fractions
- 4th Grade Math: Understanding Decimals
- 4th Grade Math: Addition & Subtraction
- 4th Grade Math: Understanding Division
- 4th Grade Math: Arithmetic With Money
- 4th Grade Math: Word Problems & Equations
- 4th Grade Math: Lines, Angles & Shapes
- 4th Grade Math: Measurement Units & Conversions
- 4th Grade Math: Measurement Problems
- 4th Grade Math: Representing Data